The UK's VAT registration threshold sits at £90,000 of taxable turnover, raised from £85,000 in April 2024. The deregistration threshold sits at £88,000. For most small businesses, these numbers feel comfortably distant — until growth accelerates and the £90,000 line arrives faster than expected.
The question we hear most often is simple: "Should I register for VAT before I have to?" The answer is rarely a flat yes or no.
How the threshold actually works
You must register for VAT if your taxable turnover in any rolling 12-month period exceeds £90,000, or if you expect it to exceed £90,000 in the next 30 days alone. The rolling test trips up far more businesses than the forward-looking test. A spike in March followed by a quieter April still triggers a registration obligation if the 12-month rolling total crosses the line.
Once you cross, you must notify HMRC within 30 days of the end of the month in which you exceeded the threshold, and registration takes effect from the first day of the second following month.
When voluntary registration helps
Voluntary registration before you reach £90,000 can be worth considering if:
- Your customers are mostly VAT-registered businesses who will reclaim the VAT you charge — so the price increase is invisible to them.
- You incur substantial input VAT on equipment, software, or stock that you cannot currently reclaim.
- You want to project a more established image to enterprise clients (rightly or wrongly, many B2B buyers expect VAT registration above a certain size).
- You expect to cross the threshold inside 12 months anyway — registering early avoids the cliff-edge.
When voluntary registration hurts
If you sell mainly to consumers or to small businesses below the threshold, voluntary VAT registration is effectively a 20% price rise — or a 20% margin cut if you absorb the cost. Many service businesses with B2C clients sit deliberately under £90,000 for years. This is legitimate, but the rolling 12-month test still applies and the moment you cross, the obligation crystallises.
The Flat Rate Scheme — still useful?
The Flat Rate Scheme allows you to pay a fixed percentage of your VAT-inclusive turnover and keep the difference. For "limited cost traders" the rate is 16.5%, which all but eliminates the benefit. For genuine service businesses with low input costs, the scheme can still produce a small surplus. We run a side-by-side comparison for every new VAT registration so the client understands which scheme actually delivers more cash.
Deregistration planning
If your taxable turnover drops below £88,000 and is expected to stay there, you can deregister. This is often overlooked: businesses that have shrunk, sold off divisions, or pivoted to zero-rated work continue charging 20% VAT they no longer have to. Deregistration restores a price-competitive position overnight.
The trade-off is that you may have to account for VAT on assets and stock you still hold at the deregistration date if the VAT on them would exceed £1,000. Our VAT team models this before recommending deregistration so there are no surprises.
Making Tax Digital — non-negotiable
All VAT-registered businesses, regardless of turnover, must keep digital records and submit returns through MTD-compatible software. If you are still on spreadsheets and bridging software, expect HMRC to focus more compliance attention on you in the next penalty cycle.
The split-business risk
HMRC has long-standing powers to direct that artificially separated businesses (for example, a husband-and-wife pair each running "separate" arms of the same activity to stay under £90,000) be treated as a single taxable person. This is one of HMRC's favourite compliance targets. If you operate multiple connected entities, get the structure reviewed before HMRC raises it.
Plan the crossing, do not stumble into it
The worst outcome is crossing the threshold without realising it, registering late, and facing penalties plus backdated VAT you cannot recover from customers. Our VAT registration service includes a monthly turnover monitor for clients close to the threshold, with a clear action plan when you reach 90% of the limit.
If you are within £20,000 of the threshold, or you suspect you should have deregistered already, get in touch for a 30-minute review.